Mercruiser Cooling System

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Parts Selection Guide

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      • Sierra 18-3317 Water Pump Kit Replaces 46-96148A8
        $72.99
        $50.99

        Mercruiser Pre-Alpha Water Pump Housing Kit by Sierra For #1/R Units without flush S/N 2763442 - 6854392 Pre-Alpha Mercruiser Drives. Models which have been retro fitted with an Alpha style ( no preload pin on top of driveshaft) must use Kit # 18-3320...

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      • Sierra 18-0549 Plug Off Cap Replaces 3852476
        $13.49
        $10.49

        Sierra 18-0549 Plug Off Cap 1" I.D. Sierra high quality engine parts are designed to meet OEM specifications. For V8 Stern Drives and Inboards 1977 - present. Interchangeable with: GLM 22290 Johnson/Evinrude...

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      • Sierra 18-3016-1 Impeller Kit Replaces 47-862232A2
        $35.49
        $24.99

        Sierra 18-3016-1 Impeller Kit For Use On Late-Model Bravos & High Performances. Sierra replacement engine parts are manufactured to meet or exceed OEM requirements. Includes gasket Use with 18-3160-1 Sea Water Pump Fits: MCM 4.5L MPI; 2000...

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      • Quicksilver 47-43026T-2 Water Pump Impeller
        $35.99
        $29.99

        Mercury - Mercruiser 47-43026T-2 Water Pump Impeller  Genuine OEM Mercury - Mercruiser part. Fits: 30/40/45/50/60 hp Fourstroke Bigfoot 60 hp (3cyl) BigFoot 75 - 125 hp (all 3 & 4 cylinder models s/n A996142 and above) 75/90/115 hp...

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      • Sierra 18-1952-1 Exhaust Manifold Replaces 99746A17
        $386.49
        $247.49

        Sierra 18-1952-1 MerCruiser V6 85-02 Exhaust Manifold  Replaces 99746A17 This Sierra exhaust manifold is for Mercruiser V6 Engines made by GM between 1985 and 2002. Fits Both Port or Starboard Sides. Mounting Gasket Included. Application...

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      • Sierra 18-0389 Heat Exchanger End Gasket Replaces 27-99960
        $10.99
        $7.99

        Sierra 18-0389 Mercruiser Heat Exchanger End Gasket Sierra high-quality engine parts are designed to meet OEM specifications. Fits: 3.7L w/ 4 inch heat exchanger. Diameter: 3-15/16" Interchangeable with: GLM 31830 Mercruiser Stern...

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      • Sierra 18-3551  Marine Thermostat
        $18.99
        $13.49

        Sierra 18-3551 142 Degree Thermostat for Mercruiser, Crusader,PCM When needing to replace your thermostat, we recommend Sierra high-quality engine parts as they are designed to meet OEM specifications at an economical price. The Sierra thermostats are...

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      • Water Pump Repair Kit, Mercury - Mercruiser 47-8M0100527
        $72.59
        $60.49

        Mercury - Mercruiser 47-8M0100527 Water Pump Repair Kit Fits: 40/45/50/60 Fourstroke BigFoot 60 (3cyl) Bigfoot 75 - 125 (all 3 & 4 cylinder 0A996142 & above) 75, 90, 115 Fourstroke V-200/225/250 (3.0L) Mercruiser Alpha One Gen II...

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      • Sierra 18-2746 Exhaust Boot Replaces 32-14358001
        $48.99
        $34.49

        Sierra 18-2746 Mercruiser Exhaust Boot Sierra 18-2746 Exhaust Boot fits MCM GM V-6 & V-8 engines. 4" Lower Tube Interchangeable with: GLM 89130 Mallory 9-72811 Mercruiser Stern...

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      • Sierra 18-3650 Thermostat Kit
        $35.99
        $24.99

        Sierra 18-3650 Mercruiser 140 Degree Thermostat Kit  For Mercruiser Sterndrive engines using 140 degree thermostat. Fits 1998 & older MCM GM In-Line 4 & 6 cylinder engines. Kit Includes: (1) 18-2831 Thermostat Gasket (1) 18-3550...

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      • Sierra 18-2762 Exhaust Tube Replaces 70981A3
        $46.99
        $32.99

        Sierra 18-2762 Mercruiser Exhaust Elbow Tube Sierra high-quality engine parts are designed to meet OEM specifications. Fits MCM 470/485, 898, 228, 250, 260, 280, 330 & Ford 233 Interchangeable...

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      • Mercury-Mercruiser 46-96148Q-8 Water Pump Kit
        $68.39
        $56.99

        Mercury-Mercruiser 46-96148Q-8 Water Pump Kit - No Base OEM Mercury-Mercruiser Quicksilver water pump upper repair kit. Fits Mercury/Mariner 65 HP (4-cylinder) through V-6 outboards with short-vane impellers Fits Mercruiser I/R/MR/Alpha drives (s/n...

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      • Sierra 18-3577-2 Circulating Water Pump Replaces 8504541
        $244.49
        $170.99

        Sierra 18-3577-2 Big Block Water Circulating Pump for Mercruiser, Volvo, OMC For: Big block GM engines with stamped steel timing covers (Bi-Directional) Used on Mercruiser, Crusader, OMC, Pleasurecraft and Volvo Penta Marine engines. s/s from...

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      Mercruiser OEM Engine Parts Finder

      MerCruiser Cooling Systems

      The cooling system of your MerCruiser engine keeps it from overheating and ensures that it’s operating at its best. It’s important to keep the entire cooling system updated and maintained, since its health is at the forefront of your engine’s overall performance. If you need parts for your MerCruiser cooling system, simply call Wholesale Marine. We will always have just what you need.

      Keep it Cool with MerCruiser Cooling Systems

      A boat’s engine, such as your MerCruiser sterndrive or inboard engine, is a delicate piece of machinery full of moving parts that each need special attention. In times past, a boat's engine was simply cooled by pulling raw water straight out of the source the vessel was floating in, running that through the engine, and out the other end. This left an engine with several issues, such as saltwater corrosion, large debris, and lack of efficiency. Further still, this sort of cooling system once upon a time only ran at 145 to 150 degrees, as regulated by a thermostat, to avoid saltwater crystallization. This is an issue due to a number of reasons, one of which was the amount of build-up that would occur at such cool temperatures.

      Today, we have engines full of checks and balances to get our MerCruiser sterndrive or inboard at max power without overheating. And Wholesale Marine has everything you need to run preventative maintenance on your vessel and to upgrade your older parts. Water pumps, impellers, thermostats, gaskets, circulation pumps, shutter and exhaust tubes, exhaust manifolds, hoses, belts, and more are all here to fit MerCruiser cooling systems. Ready to get started? Check out our easy-to-use Parts Selection tool to quickly get you exactly what you are searching for. We stock OEM and aftermarket Mercury outboard parts and Mercury sterndrive parts for less!

      For keeping that sterndrive, inboard, or tow sport engine cool come rain or shine, you can depend on Wholesale Marine to provide high quality Mercury outboard parts and Mercury sterndrive parts from the top brands in the industry. Our same day shipping, free shipping on orders over $99, and price match guarantees give you quality parts in a timely and economical manner. Review our selection today and give us a call with your questions at (877) 388-2628. Be sure to ask about our Captain’s Club Rewards Program for additional discounts on everything you need to keep your boat in top shape for your next adventure!